Firearm

Abstract

A firearm including a barrel having a chamber and an integrally formed upper receiver having a passageway, an accessory rail extending the complete length of the upper receiver, and a guidance feature extending along the passageway. The firearm also includes an operating rod having an anti-bounce mechanism, a bolt that is rotated counter-clockwise to lock against the chamber, a bolt carrier having a safety extension disposed below the bolt that prevents a hammer from striking a firing pin until the bolt is locked against the chamber, a lower receiver, a recoil spring assembly, and a fire control group. The bolt includes a polymer spring that biases a sliding extractor against the base of a cartridge. The sliding extractor is disposed at an angle ranging from thirty degrees to fifteen degrees on the bolt face to provide a low ejection angle from the firearm.

1. A bolt configured for use in a firearm receiver, comprising:
 a sliding extractor; 
 a bolt head comprising an extractor slot to receive the sliding extractor; 
 a bolt face; and 
 a polymer spring disposed proximate to the sliding extractor and biasing the sliding extractor against a base of a cartridge to retain a base of a cartridge against the bolt face. 
 
     
     
       2. The bolt of  claim 1 , further comprising a spring recess to receive the polymer spring. 
     
     
       3. The bolt of  claim 1 , further comprising a detent disposed between and engaging the polymer spring and the sliding extractor. 
     
     
       4. The bolt of  claim 1 , wherein the sliding extractor and the extractor slot each include a cross-sectional T-shape. 
     
     
       5. The bolt of  claim 1 , further comprising an extending protrusion that is configured to be received within a cam slot. 
     
     
       6. The bolt of  claim 1 , wherein the extractor includes an extractor head configured to engage a support surface of a barrel extension to support the extractor against a base of a cartridge when the bolt is locked within a barrel extension. 
     
     
       7. The bolt of  claim 1 , wherein the extractor includes an extractor head configured to engage a support surface of the firearm receiver to support the extractor against a base of a cartridge when the bolt is locked within a barrel extension.